These adapters would run on a wM Integration Server and an SAP BC alike, as during that time (meaning from release 2.1 to 4.6) the core platform of both products was identical.
Then in March 2002 the partnership was discontinued and both companies started developing a successor version independently: SAP (who had acquired the full core Integration Server source code) started developing SAP BC 4.7, while webMethods began work on wM IS 6.0.
However, SAP also enhanced selected components of the core Integration Server, e.g. the job scheduler, the "Reverse Invoke" feature and the WmPartners package, which was completely redesigned.
SAP tried to do these core enhancements in a backward compatible way, the only exception being the WmPartners package whose architecture had to be changed radically, because the original version had proved to be a serious performance bottleneck.
This version was released in July 2008 and can be seen as a maintenance update to support newer JVMs and operating systems.